<template>
  <div
    class="todo-footer"
    v-if="total"
  >
    <label>
      <!-- <input
        type="checkbox"
        :checked="isAll"
        @change="checkAll"
      /> -->
      <input
        type="checkbox"
        v-model="isAll"
      />
    </label>
    <span>
      <span>已完成{{doneTotal}}</span> / 全部{{total}}
    </span>
    <button
      class="btn btn-danger"
      @click="handleRemove"
    >清除已完成任务</button>
  </div>
</template>

<script>
export default {
  name: "Footer",
  props: ["todos", "checkAlltodos", "removeTodos"],
  data() {
    return {};
  },
  computed: {
    doneTotal() {
      // return this.todos.reduce((pre, current) => {
      //   return pre + (current.done ? 1 : 0);
      // }, 0);
      // return this.todos.reduce(
      //   (pre, current) => pre + (current.done ? 1 : 0),
      //   0
      // );
      return this.todos.filter((item) => item.done).length;
    },
    total() {
      return this.todos.length;
    },
    // isAll() {
    //   return this.doneTotal === this.total && this.total > 0;
    // },
    isAll: {
      get() {
        return this.doneTotal === this.total && this.total > 0;
      },
      set(value) {
        this.checkAlltodos(value);
      },
    },
  },
  methods: {
    // checkAll(e) {
    //   this.checkAlltodos(e.target.checked);
    // },
    handleRemove() {
      if (confirm("确定清除已完成任务吗？")) {
        this.removeTodos();
      }
    },
  },
};
</script>

<style scoped>
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>